<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
       p {
          font-size: 30px;
          /* 大小 */
        }
       
    </style>
</head>
<body>
    <div>默认字</div>
     <p>一些个字体</p>
</body>
</html>